Looking up Jewish topics online

A friend recently asked me where's a good place to learn about Tisha b'Av, the fast day of the 9th Av which is coming up next week. He was following the conventional etiquette that you don't pester people from minority groups to tell you about their customs, you're supposed to educate yourself. For me personally, I am absolutely happy for people I know to ask me about Judaism. I enjoy explaining things, and I've been enthusiastically explaining Judaism to non-Jewish acquaintances about since I was verbal. So I don't consider asking an imposition at all. However I do appreciate the general advice, and indeed a person might actively prefer to look things up rather than asking.

( if you do want to seek out information for yourself )

Or else, go ahead and ask me. Really, I mean it!